A sequence puzzle

franktaw at netscape.net franktaw at netscape.net
Mon Jul 31 20:34:34 CEST 2006

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Here are the first 20 terms of a sequence:

1,2,6,12,60,3,21,168,504,2520,27720,4,52,364,5460,21840,371280,1113840,21
162960,5

The puzzle is to determine the rule of formation.

Franklin T. Adams-Watters

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